Combined type-writing and computing machine.



F. A. HART. COMBINED TYPE WRITING AND CDMPUTING MACHINE. APPucArlo-u min SEPT. 2o. 191|.

1,237,899. Pand Aug. 21,1917.

HG. I.

IA 1.2 37 4W/L n n FIG II ff Inuuuuru noewtoz www?? MFA' M- F. A. HART. COMBINED TYPE WRITING AND COMPUTING MACHINE. Armenian min $01.20. mi.

1 ,237 ,899 Patented Aug. 2l, 1917.

3 SHEETS-SHEET 2.

FIG. I 0.

INVENTOR-l ATTORNEY;

WITNESSES:

u V v F. A. HART.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLlcATIoM men SEPT. 2o. |911.

1,237,899. Patented Aug. 2l, 1917.

3 SHTSSIIET 3.

I 2 FG 6 N d 53 'WITNESSE` INVENTOR:

FREDERICK A.. HART, OFJERSEY CITY, NEW J ERSEY,

PUTING MACHINE COMPANY, OF NEW YORK,. N.`;Y.,

ASSIGNOR .TOUNDERWOOD COM- .A CORPORATION 0F 4NE'W YORK.

COMBINED TYPE-WRITING COMPUTING MACHINE.

Specification of Letters Patent.

Patented Aug. 2.1, 1917.

Application led September 20,1911.' `Seria1No. 650,422. f

To all whom it may concern:

` Be it known that I, FREDERICK A. HART, a citizen of the United States, residing in Jersey City, in the county Vof Hudson and State of New Jersey,'h'ave invented certain new and useful'lmprovements inl Combined Type-Writing and Computing Machines, of which the following is a specification.

My invention relates to automatically controlled devices for operating combinedtypewriting and computing machines. Iti is illustrated as attached to a machine of *the Underwood-Hanson type.

Among the objects of my invention nare the automatic covering ofthe figure keys 'and the totalizer, the 'automatic starting of a drive for the computing mechanism andthe Vautomatic releasing of-sa'id coveringdevices,

(hereinafter called locking devices). V Other objects will be pointed out'injthe specification or be obvious to those'rskilled in the art. One result isthat it will be impossible to strike a'numeral'key or take a total olf the totalizer while the computing mechanism is being driven by power, another result is that the motor takes power only when the computing machine actually requires to be driven, thus avoiding continual Waste of power at other -times The preferred form of structure here shown in detail comprises a dog operating twolinks, one of which operates the keylocking or silencing mechanism, while the other operates the releasing mechanism by closing an electric circuit around a magnet, thus moving an electric' switch to startl a motor and throw in a clutch between the motor andthe operating mechanism. This motor drives the adding machine, positively releases the silencing or locking devices, and sets the mechanism ready to Write and compute a new number as soon as the carriage is shifted. Certain features of my invention are applicable to other types of machines.

W'hile I have shown the silencing device for thefkeys in the form of a bar which interferes witlr'their ready operation, it is obvious that for some of the purposes of my invention, other forms of silencing means might be used.

In the accompanying drawings,

Figure l is a sectional elevation of anUnderwood-l'lanson combined typewriting and adding machine, of .theikind to which the alcove improvements are applied.

Fig. 2 isa frontelevation, partly in sec- 4tiomof the electro magnet, themotor, and -the connections' between them.

Fig. 3 is a diagrammatic view ofy the electro-magnet and thecontacts for starting it.

Fig. 4 is an enlarged view of the electric contacts. 'f

Fig.-`5 4is an enlarged plan view of the shifting "device operated by the carriage,

6 is a-section through the switch and lclutch `of 'the motor when at rest.

F ig. 7 is a section through the same at the moment =offstartin`g- Fig. 8 isa perspective view of a. disk, used for supporting and operating a i rotary bridge.

Fig. 9 is a side elevation of a pair of- `brushes and'the device `on whicluthey are mounted Fig. 10 is an elevation of the clutch cup Eshaped ring.

Fig. `11 is a fragmentary section showing the ends of the jacks andthe tappet for raising them.

Numeral keys 1 depress levers 2 to operate through bell cranks 3 to throw typebars 4 upwardly and yrearwardly to strike yon the front 'of platen 5, which. is mounted to travel witha letter-feedingcarriage 6, driven in the usual manner by a spring (not shown). This carriage (i is controlled by letter-feeding devicescomprisi-ng a-unversal bar 7 actuated by heels 8 on the type bars 4;, and 4forming part of a ira-me 9, which hasvibrat- 'ing supports 10, and -actuates the usual letterfe'eding dogs 11 lto control escapement Upon said carriage 6 is a denominational selector in the form of a tappet or dog 13, which is usually adjustable along the rack bar 14, and has a cam edge to lift successively jacks 15 arranged in a row, mounted on a -fulcrum 16. The rear ends 17 of the jacks press down links 18, to vibrate levers 19, which' Vare connected to linkages 2() to elevate the rear ends of a series of bals 21, whose forward ends carry racks 22, meshing with pinions 23 fixed on dial orcomputing wheels 24, whereby the latter may be rotated.

The numeral keys 1 have stems 25, t0 opcrate arms 26 fast upon shafts 27, which support linkages 28 on arms 29. 'lhese linkages are depressed when arms 26 are depressed, and are adapted to strike any one of a series of pins 30 upon the elevated rack bar 21. As the carriage 6 feeds step-by-step, the rack bars 21 are elevated in succession, and dowmvardly from each is projected'a pin 30 in the manner just described. The rack bars fall to normal position, thus bringing the depressed pins into the path of a cross bar 31 forming part of a general operator. The general operator, which also comprises a pair of arms 32 and a pair of racks 33 on opposite sides of the machine, is connected by pinions 34 and segments 35 to a shaft 36. After the pins are set up (i. c., depressed) by the numeral keysl, the general operator moves forward, and the bar 3l of the general operator engages all the depressed pins and drives forward the racks 22 corresponding distances, to turn the dial wheels 24 accordingly. The wheels are not turned on the return stroke, because of a pawl and ratchet connection not shown, but the pins are restored in their original positions ready to set up for a new number.

To drive the machine by ower, an intermittently operated motor 37) is attached to the adding machine table 39, and is provided with a main shaft 40. Upon shaft 40 is fixed worin 41 turning worm wheel 42 mounted .t0 revolve on shaft 43. Arm 44, (Figs. l and 2) fast on shaft 43, carries slide 45 mounted in bar 46. Thus when the motor 37 turns Worm 4l and worin wheel 42, if shaft 43 r0- tatcs with wheel 42 arm 44 will rotate about shaft 43, reciprocating bar 46, on ,which rests yoke 47 bolted to the rack 33 of the general operator and drives it.

Key 48 on plunger 49 depresses bar 50 (Fig. 2) to strike the end 51 of lever 52 to raise pin 53, which controls the clutch and starting switch of motor 37.

Referring now particularly to Figs. 2, 6, 7, 8, 9 and 10, pin 53 extends normally through casing 54, so as to press armV against shoulder' 56 of ring 57 compressing spring 59. Ring 57 is not ixed to hub 60 of worm wheel 42. but engages it with some friction obtained by blocks .61 pressed against 60 by springs 62 mounted on 57 by screw 63. Within sockets 64, of ring 57, rolls 64 turn freely and are normally out of contact with cup member 65 fixed on shaft 43 by key 66. Cn member 65 has coarctate or cam sockets 6 to insure this freedom from Contact` but if hub 60 turns counter clockwise slightly, it carries ring 57 and rolls 64a to the shallow part of the socket 67 and they jam. thus forcing ring 65 and hub 60 to revolve together, and the combination formsl a clutch drivingshaft 43 from worm wheel 42.

Arm 55 is formed as a turned up edge of ring 68 loose on cup member 65. A0n ring 68 is mounted the conductor ring 69, constitutin a rotary bridge havingl a gap filled by insuition segment 70. Against this ring bear the ends 71 and 72 of brushes 73 and 74 mounted on an insulator plate 75 fixed on stud 76 of the casing. Through these brushes the current driving the motor passes from wires 77. There will then -be one position of the brushes in which end 71 of brush 73 will bear on the insulator segment 70. In this position, the motor will not `Abe driven, and the parts are so arrangedthat this is the case when pin 53 is holding arm 55, as shown in Fig. 6. To start the motor the brushes and insulator segment' 7() are so set that the Withdrawal of pin 55, as shown in Fig. 7, will bring ,the conductor part of ring over brush 73, thus sending the current through the motor. This carries ring 57 around as above described till the rolls jam, and then the whole clutch revolves.

In actual operation pin 53 is dropped back immediately by the pressure of spring 78 mounted on the main frame and pressing lever 52. The motor continues to drive the machine `-till arm 55 strikes pin 53, when ring 57 iis arrestedpand rolls 64*L no longer bind. Shaft 43 accordingly stops, and current ceases to .pass through the motor, though the momentum may keep it revolvinindpendently for a time.

o -e` ect the automatic starting of the motor the following mechanism is used. Fig. 5 is an enlarged plan showing the frame 79 carrying the jacks 15. The last jack to the left bears on a link 18 which extends downward like the other links 13 above described, but carries a lug 80carrying a pin which rests in fork 81 of bell crank 82, the other end 83 of which carries a spring 84 extending from the main frame, and tending to draw link 1S upward. Beneath the boss of lever 82 is a pin 85 of insulating material resting on electric spring terminal 86 and adapted to press it against another terminal 8 and thus close a leading circuit (see Figs. 3 and 4),. A circuit wire 88 is connected to terminalsSG and 87 by suitable binding keys and leads to the windings 38 of an electro-magnet supported from the main frame by a U-shaped member 89 held to its yoke by screws 90. Above the cores 91 of the magnet is an armature 92 attached by screws 93 to lever 52 from which the starting pin 53 is hung. Also included in the electro-magnet leading circuit is preferably included a battery 94, which may consist of a few dry cells to furnish a low tension current which will not spark.

It will be evident that when the dog 13 is moved along with the typewriter carriage past the jack, for the last or units column of giu-es, it will strike the last jack and depress the pin to close the leading circuit around the magnet. This will draw the armature down, raise the starting iin, and the n iotor in the main circuit will drive the worin wheel till one stroke of the general operator is finished, thus adding in the numerals just written, and restoring the pins ready to be set for a new number.

Special jack 15 is cut away at 95, Fig. 11, so that it is not held raised, but is only raised'momentarily as the carriage in its letter-spacing movement carries the tappet 13 roinone,position of rest tothe next. Thus the link 18 closes the leading circuit just long enough to energize the magnet Iand thus raiscthe starting pin. Fig. 11 shows thepositionoi the parts after passing the units jack and striking the special jack.

A. baror guard 9G is providedior obstructing thc operation of the numeral keys 1, and a shutter 97 for covering the totalizer 24, Bar 90 is fixed on rods 98 so that it may readily swing from normal (shown in dotted lines) to coveringposition, and these rods are fast on rock shaft 99. Shutter 97 is rotated by rod 100, the latterpivoted to 97 at 1,01 and to lever 102 at103. Lever`102 is fast on said rock shaft 99, so thatthe shutter 97 and bar,96 move simultaneously.

Operating arm v104 isnormally drawn down to swing thebarfree of the keys and the shutter from the totalizer. 1t is locked in this position4 against the tension ofvspring 105, by slidable latchy 10G, the point 4107 of which is adapted to rest in notch 108 of Said operating arm.

After a numeral Yhas been written in the units column, the carriage 0 moves on one step (to the Fig. 11 position) and the tappet 13 momentarily raises the special jack 15 and thereby depresses link 1Sa to act through bell crank 109 lto draw back said latch 10G from notch v10S to release operating arm 104 and 4permit spring 105 to o erate. A guide pin 110 is provided for late 106.

The connection between spring 105 and operating arm 101 includes a bell crank4 111 which raises fork 112, in whichfrests pin 113si on a projection of said operating arm.

The general operator depresses operating arm 104 by means of a bell crank 113, which has one arm 1141 restingin a notch 115 in the side frame33 of said general operator. The forward movement of Vthe general operator causes this arm 114; to ride up vOnto the fiat side 11G of said` side frame 33, and swings arm 117 of said bell crank 113 against an arm V11S of bell crank 111. This raises said arm 118 and depresses operating arm 101 so that slidable latch 106 may be driven into notch 108 by sprinor 119 on shaft 120 and relock the key guarda-,1nd totalizer shutter in inoperative position.

The operation of the machine is ,asfol lon-'st The operator depresses numeral keys printing numbers :uid recording theniin the computing device inthevarious columns till one -is struck in the units column. After passing this the tappet on K the carriage, which hasy successively depressed .theV jacks for each column to control vthe computing mechanism, momentarily depresses the special jack. Thisin'ovesone' linkj to lock the numeral keysy andthe totaliz'en, -While, the otherraises the` starting pin, sending current through the ,motor to dlrivithecomputing mechanismvby theclutcfh. This'automatically releases the lockingvdevicea'and when the general operator has completed one full movement, the clutch ,releases itself and breaks the current. I

Where in the vspecification 4and liny the claims, I have used the term"silencing,`de vice, or silencing n ieans, it is ,to be understood that I refer to the fact that the settingup of ythe indexin devices by operating the keys in4 the usua manner is discontinued, und I do not limit myself tothe particular form of construction shown. Anyiorm of device by which Athe yfunction of the keys Afor controlling vthel settingof digits is 'interered with or rendered quiescent, orput-,at rest, or held in abeyance, is Within the scope of -theterm silencing i Variations may be 'resorted ,to within the scope of the invention, f nd .Portions ofthe 95 improvements may' be i used without others. HavingV thus described 4 my invention, `I claim: i

1. The combination with a computing mechanism ,actingz through a cycle ofi'operation, of indeXi-n Edevices for controlling'said computing 'mec anism .during a, setting-up portion of said cycle,4 'means for silencin'gthe indexing devices when `they have .completely set up a number, ,andina-ansfor., rendering 105 said silencingwmeans ineiective, including a motor and a circuit to said motor,4 .automatically closed; when lsaid indexing, dvichave been completel `set 2. 'Ehe' 'com4 ination ,with a 'computing 110 mechanism acting through a jcycfl'ecf operation, of indexin devices 'fori controlling, the compu't1ng `,mee' iaiiism during, aisetting-up portion `of said cycle, mechanism for automatically preventing 4a continuation of the 115 cycle of yoperation when ,said indexing devices have 'completely set up a number, means for renderingsaid preventing means ineffective, and a motor controlling said means, brou ht into piay automatically 120 when saidl in exingfdevices have been completelry set up.

3, he combination with a computing mechanism, of indexingdevices forcontrolling the action of' said coni uting` mechanisrn,means for silencing said indexingdevices, coming intoplay automatically at the conclusion of the 'indexing operation, and driving means brought into 4play automatically at the same time as .Sdffirst-mentioned 130 means for operating said com uting mechanism and rendering said rst-mentioned means ineffective.

4. The combination with computing mechanism, of means forA initiating a computing action of said computing mechanism, said computing ,mechanism including a series of devices and members 'controlling said devices vvhich numbers may be temporarily registered,`silencing meansfor' sald initiating means coming into play automatically at the completion of the re istering of a number, a motor, and contro ling means coming into play automatically at substantially the saine time as said silencing means for d riving said computing mechanism to carry numbersfom fsaid members into said' devices, andV alsofor rendering' ineffective said silencing means.' Y v 5.' The combination with a' computing mechanism, of a series of numeral keys for cdntrollin'g the action of said computing mechanism, a series of jacks for controlling said computing mechanism, a specialjack, a tappet operating said 4jacks successively, `a silencing device for sa'idlnumeral keys controlledby'said special jack, and a computing-mechanism drive and means for rendering said silencingv device again' active, also controlled byfsai special jack.I

' 6." The combination with a computing mechanism, of-a series of'nu'meral keys for Acontrolling the yaction of said computing mechanism, 'a series of jacks jfor overning the Vactionof said computing'mec 'anism, a special jack, a tappet operating said jacks successively, a silencin device forsaid numeral keys controlled' y said Aspecial jack, and retirin means for said silencing device also contro v'ed by said special jack.

7'. A comp'utin'g'machinehaving settingup mechanism and com uting mechanism, a series'of jacks controlling 'saidcomputing mechanism, a special ack, a silencingdevice for said 'setting-up mechanism controlledby said Ijack, a link operated by said jack,h an electric' circuit controlled by said link," a motor,aV device for controlling the startin of said motor controlled by said circuit, an a general operator driven from said motor to render said silencing device ineffective, and operating said computing mechanism.

8. Acombined typevvritingv and computing machine havingL a traveling carriage and a computing mec anism, said computing mechanism having a cycle of operation 'comprising a settin -up portion and an operating portion; an comprising in' combination, means for silencing saidjsetting-up portion, means for controlling said operating portion, and means under control Vof said traveling carriage for concomitantly calling into action both said silencing means and said operation-controlling means. f

9. A computing machine having a traveling carriage, computing devices, indexing devices which are preliminarily set to represent a number, and a general operator for carrying into the computing devices the number set by said indexing devices; and comprising, in combination, means for initiating themovement of the general operator, and means for silencing said indexing devices untilthe general operator has completed its Work ofV carrying numbers into the -computing[devices and comprising a jack controlled from said carriage, and means controlled by said jack for bringing into action both said means.

10 In a key-controlled computing mechanism, a carriage, step-by-step feeding means for said carriage, type-bars for writing on paper carried by the carriage, a computing device, keys controlling said computing dc vice, said type-bars`fa'nd said step-by-step feeding means, a series of jacks, one for each column of numerals registered by the computing device, a special jack next to the units column jack, means on the carriage to operate said jacks successively by the step-bystepV feeding motion, a member moved'by said`spec1 a l"ackrto silence said keys audfafinembera so moved by said speclal jackfto operate ,said computing device, 'and to render ineli'ectve said silencing member.

11.511,1 akeyl controlled computing mechanism,`a"carriage adapted to carry a sheet to be Written on,'type bars, keys controlling and operating the type bars, means on the carriage'lfor 'momentarily closing a leading circuit and silencing said keys, and means controlled by the leading circuit to drive thejcomputing mechanism and release said keys.` y 12K. ,Ina combinedtypewriting and computingmachine, the combination with computing wheels and numeral keys, of members in which'numbers are `temporarily registered, a motor for carrying numbers from said members 'into said wheels, a selector on said carriage for selecting said members 'sem'atim to register numbers on them, and means moved by said selector for silencing said keys Aands'tarting said motor.

'13. In a combined typewriting and computing machine, the 'combination with computing Wheels and numeral keys, of members'in which numbers are temporarily registered,` a motor for carrying numbers from said members into said wheels, a selector on said carriage for selecting said members se- M'atim to register vnumbers on them, a cover for said Wheels, and means moved by said selector for covering said Wheels, starting said-motor, and uncovering said Wheels by said motor. t

14. 'In a combined typevvriting and computing machine, the combination with computing Wheels and numeral keys, of members in which numbers. are temporarily registered, a motor :forcarrying numbers from said members into said -W-heels, a selector on said carriage for-selecting said members seriatz'm to record numbers on them, means for covering said Wheels and locking said keys. and means moved by said selector for making said coverand lock effective, and `for unlocking and uncovering said keys and wheels by the operation :of said motor.

1,5. In a combined typewriting and,com putingmachine, the-combination with a denominational selector, of a series of identical jacks movedwseriatz'm by said selector, a jack havinga face half the Width of said identical jacks, an extension on said jack to doubleits Width, and two links moved by said double Width.

16. Iin a combined typewrliting and computingmachine,` the combination with computing wheels and numeral keys, of members inwvhich numbers `are temporarily'regis- .tered, a motorjor carryin numbers from Vsaid ,members into said'- W eels,a selector on said carriage for selecting said members sem'atz'm to register numbers on them, a' series of jacks `by which said members' are selected, an electric circuit, and a jackv for closing said circuit momentarily to cause said motor. to carry numbers from said members to saidwheels and to silence said keys, said motor, rendering said keys again effective. 4 A

m17. -In a combined typewriting and computing machine, ythe combination with computing wheels andnumeral keys, of members in which numbers 'are temporarily registered, a motor for carrying numbers from said members into said Wheels la selector on said carriage-for selecting said members seria'tz'm to register numbers on them, a series of jacks by which .said members are selected, anothery jack, a link extending from said-jack to operate a silencin device for said keys, and a shutter for sald Wheels, a

vlinlr extending from said jack to control the starting of sald motor, and means operated by said motor to renderlsaid silencing device ineiective and remove said shutter from.v said .Wheels 18. 4The combination with, a computing mechanism, of a series. of numeral keys. for controlling the action of said computing mechanism, silencing means for ,said numeral keys, a motor for dri-ving said compittingA mechanism, and a single jack for controlling both the action of said motor and the action of said silencing means.

19. The combination Witlra computing mechanism, of a traveling member controlling 'avcomputing zone for said computing mechanism, a `series of numeral keys for controlling the .action of :said computing mechanism, a motor for driving said compnting mechanism, silencing means for said keys, and means operated at the end 0f a computing zone b v said traveling memberto actuate said silencing means and to enable said motor to drive said computing'mechanism. n.

20. The combination with a computing mechanism, of a traveling member controlling a computing' zone for Said computing mechanism, a series of numeral ,keys-l for controlling the action of said computing mechanism, a motor for driving said computing mechanism, silencing means for said keys, means operated at the end of a computing zone by said traveling member to actuate said silencing means and to enable said motor to drive saidcoinputing mechanism, and releasing means for said silencing means driven by said motor at the driving of said computing mechanism. u

21. The combination with a computing mechanism, of a series of numeral keys for controlling the action of said computing mechanism, traveling means for` controlling the computing zone of said computing mechanism, a motor for driving' saidcornputing mechanism to run up a computationimeans comingl into play at the end of'a computing zone as determined by said traveling means for enabling said motor to drive said computing mechanism to run up,y the number of the computing zone, and silencing means for said keys also coming into play at the end of thecomputing zone. s

Q2. In a computing device, a jack broadened at one end to `increase the scope of 'its action, and doubly narrowed at its foppositc end to shorten the period of its action. ,Y

23. The combination with a .computing mechanism, of a motor for driving said computing mechanism, numeral keys for controlling the action of said computing mechanism, a traveling tappet connectedtoj control the` denominations of said'computing mechanism, a trip for said motor, silencing means for-said keys, and a singlev jack operated by said tappet at the end of a computin@r zone for concoinitantly actuating said b silencing means and said trip.

' 2l. A combined typewriting and computing machine having a traveling' carriage and a computing mechanism, said computing mechanism having a cycle of operation comprising a setting-up portion and an operating portion; `and comprising, in combination, means for Iinitiating the operating portion of the cycle, means for silencing said setting-up portion until said operating portion is completed, both said means being under the control of said traveling carria e, and means brought into acti-on during t e operating portion of said cycle to rendersaid silencing means ineffective.

25. The combination with a computing mechanism, of a series ot jacks connected to control the action of said compu-ting mechanism, numeral keys controlling the actuation of said computing mechanism, a m0- tor fordriving said computing mechanism, silencing means for said keys, a traveling element operating said liacks successively, and means 'controlled by the last jack in the scries 4for Yconcomitantly enabling the drive of said computing mechanism by said motor and causing a coming into play of said silencing means.

r26."The combination with a computing mechanisimof a series of jacks connected to control the' act-ion of said computing mechani'sm, numeral keys controlling the actuation of said computing mechanism, a motor for driving said computing means, silencing ymeans for said keys, a traveling element Voperatingsaid jacks successively, and means controlled by the last jack in the series for concomitantly enabling the drive of said computing mechanism by said motor and caujsinga coming into play of said silencing means, said silencing means remaining in a'ction'in case said motor fails to drive said computing mechanism completely, and being released on the driving of said computing'mechanism by said motor. Y

*27. The combination with a plurality of computing wheels, of valuating mechanism "for accumulating digit by digit, a number to be run into said computing Wheels, driving jmeans for running the number after accumulation into said computing wheels, numeral keys for controlling the accumulation of thedigits, all of said parts comprising a computing mechanism, guarding means for silcncingtlie functions of said computing mechanism when all of the digits of a number to be run up into said computin wheels have 'been accumulated prior to their transfer ,to said computing Wheels, and means `coming into play automatically at the completion of theaccumulation of the digits of a number tobe computed, to cause an actuation of said drivingmeans to run the accumulated digits concomitantly into said computing Wheels, and at the termination of such action to silence said guarding means lso as to permit further functioning of said 4computing mechanism.

28.' A computing machine having a travcling carriage, computing devices, indexing devices which are preliminarily set to representanu'mber, and a general operator for carrying' into the computing devices the number vset by said indexing devices; and comprising, in combination, means controlled by'said carriage for initiatin the movement ofthe general operator, an for silencing said indexing devices until the general operator has completed its Work of carrying numbers into the computing devices.

29. A combined typewriting and computing machine having a traveling carriage and computingmcchanism, keys for Writing a number digit by digit, and a general operator for carrying the number set by the keysv into the com uting mechanism; and comprising, in com ination, means controlled by the carria e on writing the digit in the units column for initiating the movement of the general operator and for silencing the numeral keys until the general operator has completed its work of carrying 7.5 numbers into the computingmechanism 30. A computing machine having a traveling carriage, computing devices, Aindexing devices which are preliminarily set to represent a number, and a general o erator for carrying into the computing .evices the number set by said indexing devices; and comprising, in combination, means for initiating the movement ofthe general operator, and means for silencingsaid indexing devices until the general operator has c ompleted its work of carrying'numbers into the computing devices, and comprising a jack controlled from said carriage, and means controlled by said jack for directly bringin said silencingimeans into play at the initiation of the movement of the general operator and indirectly renderin the same ineffective at the conclusion o the movement of the general operator. 95

31. A computing machine having a traveling carriage, computing devices, indexing devices which are preliminarily set to represent a number, and a general-operatorlfor carrying into the com uting devicesV the 100 number set by said in eXing devices; and comprising, in combination, means for m1- tiating the movement of the -general operator, and means for silencing said indexing devices until the general operator has c om- 44-105 pleted its work of carrying numbers` into the computing devices, and comprising a jack controlled from said carriage, Vand means controlled by said jack for directly bringing said silencing means into play l110 at the initiation of the movement of the general operator and indirectly rendering the same ineiective through the medium of the general operator.

32. In a combined typewriting and c0m 115 puting machine, the combination vvith a computing mechanism,of a serles of indexing devices, 'each one of which may control the com utin mechanism in any denominaticnt creo operating means for carry- 120 ing linto the computing mechanism numbers as indexed by said devices, and means `tor-silencin said indexing devices and concomitantly ringing into action said operating means.

33. In a combined typewriting and computing machine, the combination with nu- 'meral keys and computing wheels, of mem- Tbers in which Vnumbers are temporarily registered as written, a general operator forlo carrying numbers from said members into said Wheels, a traveling carriage, a denominational selector on said carriage, a jack moved momentarily by said denominational selector to obstruct the operation of said keys7 and an extension on said jack acting automatically during a computing operation to cause the operation of said general operator.

34. In a combined typewriting and computing machine, the combination with numeral keys and computing Wheels, of members in which numbers are temporarily registered :is written, a general operator for mrrying numbers from said members into said Wheels, a traveling carriage, a denominational selector on said carriage, a jack moved by said denominational selector to obstruct the reading of said Wheels, and an extension on said jack acting automatically during a computing operation oo cause the operation of said general operator.

FREDERICK A. HART. Witnesses:

GLENFIELD S. YOUNG, PAUL ZIRoN.

Copies of this patent may be obtained for ive cents each, by addressing the Commissioner of Patents, Washington, D. C. 

